So we are installing a blade fuse panel. I got it in position and along with some other components and then happened to look at the instructions for the blade fuse block. Shouldn’t of done that! It says I need a 150 amp fuse max size for the fuse panel. OK I looked at them in the store and there is a lot of different sizes of fuses. Should I just put in the max size or how can I tell what my needs are?
Thanks,
Chip

I would need to read the directions, but maybe what they meant was that the wire supplying the power to the panel should be big enough to handle at least 150 amps and fused between the battery and the panel with a 150 amp fuse?

I count 12 fuse blocks on that panel. If they all had 10 amp circuits that ran at the same time, that's 120 amps. (unlikely that would ever happen, but you need to plan for the worst)

Relationships are everything to me..everything else in life are just tools to enhance them.

The purchase price of a boat is just the admittance fee to the dance...you still have to spend money on the girl...so court one with something going for her with pleasing and desirable character traits others desire as well... or you could find yourself in a disillusioned relationship contemplating an expensive divorce.

Fuses are to protect the wire, not the item at the end of it. The exception to this might be low draw electronics that use a smaller fuse. If using 14 awg wire which is pretty normal, 15 amps is appropriate. Thar is why all Blue Seas circuit breaker panels come standard with 15 amp breakers. The maximum rating for the fuse block is 100 amps.

Tommay makes a good point. That is not a good place for either the fuse block or the main switch. In an emergency - shorted battery for instance - you need to reach the main switch. It should not be in the immediate vicinity of the batteries. And corrosion from the batteries will not be good for either the switch or the fuse block. Or any bus excepting the maxi bus on the left.

I try to keep all wire connections (other than heavy wire buses) as high as possible, usually around counter height. Exceptions are bilge pumps, settee front lights, and engine wiring where necessary. No small gauge wires run in the bilge except for bilge pump and transducer wiring.

Sorry to blow your entire new electrical design, but the guys are right. Get those items (fuse block and switch) out of the battery box. Even if vented, it's not a good idea to have those things in there. You could keep the large bus bars, but the smaller items will die in there, very very soon.

If there's an electrical fire near the batteries... you really don't want to have to reach over them to shut them off...since you'll give the fire a lot more oxygen...

You really want to strap the batteries down or install a wooden bar to hold them down. You really should put covers on the positive terminals, if not both sets.

It would also make a lot more sense to have the battery cables go to the bus bars in a different area of the boat and have the fuse panel and switch located there. It would make it a lot easier to work on them and not risk accidentally shorting the batteries.

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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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